34114553

Appears in sequences

• a(n) = Sum_{k=0..floor(n/6)} binomial(n-3k,3k).at n=39A100134
• Lower level digraph derived from a voltage graph.at n=40A115055
• a(n) = Sum_{k=0..n} binomial(3*k,3*(n-k)).at n=13A391902